Abstract: A mechanical biped assembly (10) consisting of a base assembly (12) which includes a lower section (14) that is hinged to an upper enclosure (28). Attached to the upper enclosure (28) is a biped body (60) consisting of a pelvic enclosure (62) that is supported by a left leg (102) and a right leg (112) and that has pivotally attached a thorax enclosure (124). The thorax enclosure (124) has pivotally attached a left arm (160), a right arm (170), a rotatable neck (186) to which is pivotally attached a head (200). Within the base assembly (12) and the biped body (60) is located a kinematical linkage mechanism (214) that is activated by a single push of the upper enclosure (28). When the mechanism (214) is activated, the thorax enclosure (124) pivots to the right, which is then subsequently followed by the left arm (160) pivoting upward, the right arm (170) moving to the right, and the head (200) rotating to the left and pivoting upward.