The Grandmaster challenges Loki to a Contest of Champions. Loki's team will be Ultraforce, well the Grandmaster's will be the Avengers.
Mtch-ups include:
Captain America vs. Hardcase
Crystal & Black Widow vs. Siren & Topaz
Iron Man vs.Prototype
Starfox vs.Contrary
The Vision vs. Ghoul
and Thor vs. Prime
Continued in UltraForce/Avengers #1.