"My first line was 'Snake Vs Monkey'", says Metal Gear Solid 3's David Hayter: "I could only ask, 'Why am I saying this?'"

Snake stands next to a giant ape mech in the Mesal Gear Solid crossover between Metal Gear Solid 3 and Ape Escape.

Gaming's always embraced crossovers, even before the launch of PS1, with apparently disparate IPs getting together in titles like Battletoads & Double Dragon. Later in the '90s crossovers started to really take off thanks to fighting games like Capcom's bouts with Marvel and SNK, and even manga character Gon's appearance in Tekken 3.

Suddenly the floodgates were open, and everyone had their own hopes for crossover games. Dream crossovers like Street Fighter Vs Mortal Kombat, Crash and Spyro, or Jak and Daxter teaming up with Ratchet and Clank, were becoming highly requested. Luckily for PS2 owners, one of the most obvious crossovers ever came to be when Metal Gear Solid crossed over with… Ape Escape.