Army Men: Sarge's Heroes - Mission 13.5: Rocket! - Sega Dreamcast

Sarge Hawk and Colonel Grimm narrowly escaped by helicopter from the Tan attack on their Green base, but on the way they spot a Blue tank in the middle of the nearest town, which is very suspicious given the circumstances, and Hawk He decides to go and investigate. Trying to follow the Spy, Sarge enters some kind of strange, illuminated cave or hole, which leads him to what appears to be another world totally different from his own: a vast and gigantic world. But to the misfortune of the Blue spy, the place where they ended up is too small to escape, and Hawk captures him back for debriefing.
The Spy provided a lot of information about the plans of Plastro and the Tan army, about the discovery of the "Portals" and the weapons that Plastro can get from there. Also the whereabouts of the Heroes.
Having rescued Hoover, Riff, Thick, and Shrap, Sarge is informed by Colonel Grimm that Plastro has sent an ultimatum to the Green nation: "Surrender or be destroyed." The Greens' only option is for Hawk to destroy the last remaining portal in the most heavily guarded corner of Fort Plastro. Hawk eventually manages to use the portal after fighting his way through in an epic one-man battle. After believing Vikki had betrayed the Green army, Hawk rescues Scorch and is told that she stayed with Plastro to try to gain his trust and gain information, so the two of them deliver that valuable strategic information to the Green army.
Returning to Fort Plastro again, this time Sarge attacks from the east side of the base, managing to take it with the help of the Green army for the finale.
After this, Vikki is discovered and Plastro sends a bomb through the portal, destroying the Greens' ability to pursue him, with Hawk being the only one who manages to pass through the portal by using it to escape. He fell into a giant sandbox, watching in the distance as Vikki calls for help while she is kidnapped by Plastro.
Finally Hawk manages to overcome the sandpit and uses a rocket to go to the coordinates where Vikki was taken....