Stranded Siren is a mission in which Chuck is tasked with returning a "mermaid" from Atlantica Casino. The mermaid turns out to be Tammy Blaine. Due to her costume, Chuck will be forced to carry her even if he does have the Leadership Magazine.
When Chuck Greene finds her at the Atlantica Casino, she explains her predicament and agrees to follow Chuck to the Safe House. However, on account of her costume, she is unable to walk and has to be carried. When not carried, she is unable to stand and can only flop around on the floor (which is quite humorous).