Strikeforce: "Heavy Artillery" is officially set to go down as all 24 participants competing on tomorrow night's event made weight earlier today from the main concourse level of the Scottstrade Center in St. Louis, Missouri.

The event takes place tomorrow, May 15, at the same venue as today's weigh-in ceremony with the event's main card to be televised on Showtime beginning at 10 p.m. EST.

Things didn't go quite as planned for four of the 24 fighters, all of whom failed to make weight in their first attempt.

First, main card fighter Ronaldo "Jacare" Souza weighed in at 186.5-pounds, which is half-a-pound over the allowable 186-pound middleweight limit. His opponent, Joey Villasenor agreed to fight Souza at 186.5 pounds.

The rest of the miscues came from preliminary competitors.

Jesse Finney came in at 172-pounds, which is one pound over the 171-pound welterweight limit. His opponent Justin DeMoney also agreed to fight him at that weight. Erik Steenberg agreed to fight Tom Aaron at 157.5 lbs, which is one-and-a-half pounds over the 156-pound lightweight limit, and Lee Brousseau came in heavy on his first attempt, but made weight in his second try, weighing in at 204-pounds for his light-heavyweight bout against Fransisco France.

Headlining the event is a Strikeforce heavyweight title fight between champion Alistair Overeem and challenger Brett Rogers. Overeem came in at 253-pounds, while Rogers weighed in at 264-pounds. In the co-main event, former UFC heavyweight champion Andrei Arlovski will look to get back on track after dropping two straight, when he takes on Antonio Silva. Arlovski weighed in at 242-pounds and Silva came in more than 20 pounds heavier at 265.5 pounds.

Other bouts on the main card include the aforementioned middleweight bout between Brazilian submission expert Ronaldo "Jacare" Souza and Joey Villasenor. Also, Roger Gracie will make his highly anticipated Strikeforce debut against former UFC heavyweight champion Kevin Randleman in a light-heavyweight attraction.

Rounding out the main card is a light-heavyweight bout between up-and-comers Antwain Britt and Rafael Cavalcante.

Below are the official weigh-in results for Strikeforce: "Heavy Artillery":

Televised Main Card:

Alistair Overeem (253) vs. Brett Rogers (264)

Andrei Arlovski (242) vs. Antonio Silva (265.5)

Ronaldo "Jacare" Souza (186.5) vs. Joey Villasenor (186)

Roger Gracie (205.75) vs. Kevin Randleman (205)

Antwain Britt (204.5) vs. Rafael Cavalcante (206)

Preliminary Card:

Justin DeMoney (169) vs. Jesse Finney (172)

Lyle Beerbohm (156) vs. Vitor Ribeiro (156)

Darryl Cobb (184) vs. Booker DeRousse (187)

Mike Chandler (170) vs. Sal Woods (170)

Lee Brousseau (204) vs. Fransisco France (206)

Tom Aaron (157.5) vs. Erik Steenberg (155)

Matt Ricehouse (156) vs. Greg Wilson (155)

(Props to Combat Lifestyle for the pic.)